“The Portland Society of Art and Winslow Homer’s Legacy in Maine,” exploring the artistic relationship between Homer and the architect John Calvin Stevens and the early years of the Portland Society of Art, featuring architectural drawings and a range of paintings and watercolors by Homer and others, Portland Museum of Art. portlandmuseum.org. Through Feb. 3.

“Iconic America: The U.S. Outline as National Symbol,” University of Southern Maine (Osher Map Library and Smith Center for Cartographic Education), Portland. usm.maine.edu/maps. Through Feb. 28.

New Year’s at Noon Pajama Party, special countdown and balloon drop, free for members and kids under 18 months, Children’s Museum and Theatre of Maine, Portland, $9. kitetails.org. 11 a.m. to 2 p.m. Monday.

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